Question

我正在Windows上运行python示例代码，每次执行计时器线程后，都会使用如下所示创建一个新线程，但是旧线程从未回收，这确实使线程数量不断增加，这困扰着我担心我的软件不久或将来会消耗掉整个PC内存。我看到其他许多人也遇到了相同的问题，当使用pydev进行调试时，最终会报告为“ TclError：堆栈空间不足”！

这是我的pydev调试堆栈的列表，它将不断增加，直到“堆栈空间不足”为止，从堆栈视图中，我看到线程数量非常疯狂……

Thread-1913 - pid_9200_id_155817632
Thread-1915 - pid_9200_id_156052840 
Thread-1917 - pid_9200_id_156052112 
Thread-1919 - pid_9200_id_156326208 
Thread-1921 - pid_9200_id_156326264

pydev报告的错误如下：

pydev debugger: starting (pid: 9200)
Exception in thread Thread-1921:
Traceback (most recent call last):
  File "C:\Python27\lib\threading.py", line 801, in __bootstrap_inner
    self.run()
  File "C:\Python27\lib\threading.py", line 1073, in run
    self.function(*self.args, **self.kwargs)
  File "D:\work\tools\eclipseWorkspace\timerTest.py", line 46, in handle_function
    self.hFunction()
  File "D:\work\tools\eclipseWorkspace\timerTest.py", line 56, in printer
    lab['text'] = clock
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1337, in __setitem__
    self.configure({key: value})
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1330, in configure
    return self._configure('configure', cnf, kw)
  File "C:\Python27\lib\lib-tk\Tkinter.py", line 1321, in _configure
    self.tk.call(_flatten((self._w, cmd)) + self._options(cnf))
TclError: out of stack space (infinite loop?)

下面是我的代码，它设置一个计时器，然后调用“循环”功能

from threading import Timer, Thread, Event
from datetime import datetime
import Tkinter as tk

app = tk.Tk()
lab = tk.Label(app, text="Timer will start in a sec")
lab.pack()

class perpetualTimer():

def __init__(self, t, hFunction):
    self.t = t
    self.hFunction = hFunction
    self.thread = Timer(self.t, self.loop)

def loop(self):
    self.hFunction()
    self.thread = Timer(self.t, self.loop)
    self.thread.start()

def start(self):
    self.thread.start()

def printer():
    tempo = datetime.today()
    clock = "{}:{}:{}".format(tempo.hour, tempo.minute, tempo.second)
    try:
        lab['text'] = clock
    except RuntimeError:
        exit()

t = perpetualTimer(0.1, printer)
t.start()
app.mainloop()

Answer 1

您的代码未在我的Python上执行。触发计时器线程后，无需取消它。换一个新的。另外，将第一次创建的Timer放在初始化例程中，然后等待它执行处理功能会更清洁：

flatDir {
    dirs 'libs'
}

所有Timer线程在触发后终止，以后将被垃圾回收。它们不会填满所有可用的内存。

Python 2.7，thread.Timer生成太多未回收的垃圾线程

1 个答案: